Method for the leaching of solid matter from sludge

Details Method for the leaching of solid matter from sludge Method for the leaching of solid matter from sludge

C - Chemistry, Metallurgy

02

F

C02F 11/06 (2006.01) B01F 3/04 (2006.01) B01F 5/10 (2006.01) B01F 7/00 (2006.01)

Patent

CA 2381475

The invention relates to a method for the leaching of solid matter from a sludge with the aid of a gas containing oxygen, whereby the solid matter of the sludge is recirculated in a tall reactor equipped with a central pipe in the centre of the reactor and a double-action mixer located in the vicinity of the lower edge of the central pipe. A flow is formed with the aid of the mixer which sucks the sludge from the central pipe downward, and a gas to be conducted into the sludge in the bottom part of the reactor is dispersed in the form of small bubbles into the sludge outside the central pipe and the flow direction of the sludge is turned upwards in the outer casing of the reactor.

Cette invention se rapporte à un procédé permettant le lessivage de la matière solide contenue dans une boue à l'aide d'un gaz contenant de l'oxygène, la matière solide de la boue étant remise en circulation dans un réacteur allongé comportant un tuyau central au centre et un mélangeur à action double à proximité du bord inférieur du tuyau central. On forme à l'aide du mélangeur un écoulement qui aspire la boue du tuyau central pour la diriger vers le bas, et un gaz devant être injecté dans la boue dans la partie inférieure du réacteur est dispersé sous la forme de petites bulles dans la boue à l'extérieur du tuyau central et la direction d'écoulement de la boue est orientée vers le haut dans l'enveloppe extérieure du réacteur.

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